nats-upload: support just cleaning

.gitignore

@@ -27,3 +27,4 @@ go.work.sum
 
 ./bin
 bin
+nats-upload

main.go

@@ -28,11 +28,12 @@ func main() {
 		skipNotify  = flag.Bool("skip-notify", getEnvBool("INPUT_SKIP_NOTIFY", false), "Skip publishing update notification")
 		cleanup     = flag.Int("cleanup", getEnvInt("INPUT_CLEANUP", 0), "Keep only N most recent versions (0 disables cleanup)")
 		cleanupAll  = flag.Bool("cleanup-all", getEnvBool("INPUT_CLEANUP_ALL", false), "Cleanup all binaries, not just current one")
+		justClean   = flag.Bool("just-clean", getEnvBool("INPUT_JUST_CLEAN", false), "Dont upload, just cleanup old versions")
 	)
 	flag.Parse()
 
-	if *directory == "" {
-		log.Fatal("Directory path is required")
+	if *directory == "" && *cleanup == 0 && *justClean == false {
+		log.Fatal("Directory path is required or cleanup must be enabled")
 	}
 
 	ctx := context.Background()
@@ -60,6 +61,7 @@ func main() {
 		log.Printf("Created object store: %s", *bucketName)
 	}
 
+	if *directory != "" && *justClean == false {
 		err = filepath.Walk(*directory, func(path string, info os.FileInfo, err error) error {
 			if err != nil {
 				return err
@@ -109,6 +111,7 @@ func main() {
 		}
 
 		log.Printf("Successfully uploaded all files from %s to NATS object store '%s'", *directory, *bucketName)
+	}
 
 	if *cleanup > 0 {
 		log.Printf("Cleaning up old versions, keeping %d most recent", *cleanup)